workqueue(9) tests: Fix mistake in rev. 1.9.

Somehow, despite manually verifying a build/install/test of every
revision in my patch series, I managed to commit the wrong version of
the file for what

workqueue(9) tests: Fix mistake in rev. 1.9.

Somehow, despite manually verifying a build/install/test of every
revision in my patch series, I managed to commit the wrong version of
the file for what became rev. 1.9, so the test was just broken when
it went in and remained broken in the commit where I fixed the real
bug and removed the xfail marker on the test.

PR kern/5757

XXX pullup-10
XXX pullup-9
XXX pullup-8

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workqueue(9) tests: Add test for PR kern/57574.

XXX pullup-10
XXX pullup-9
XXX pullup-8

workqueue(9) tests: Destroy struct work immediately on entry.

workqueue(9) tests: Nix trailing whitespace.

Fix build

Add a test case for workqueue_wait

Functionalize some routines to add new tests easily (NFC)

Fix a race condition on taking the mutex

The workqueue worker can take the mutex before the tester tries to take it after
calling workqueue_enqueue. If it happens, the worker calls cv_broadcast befo

Fix a race condition on taking the mutex

The workqueue worker can take the mutex before the tester tries to take it after
calling workqueue_enqueue. If it happens, the worker calls cv_broadcast before
the tester calls cv_timedwait and the tester will wait until the cv timed out

Take the mutex before calling workqueue_enqueue so that the tester surely calls
cv_timedwait before the worker calls cv_broadcast.

The fix stabilizes the test, t_workqueue/workqueue1.

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Tweak use of cv_timedwait

- Handle its return value
- Specify more appropriate time-out periods (2 ticks is too short)

Add simple test for workqueue(9)